Bunsen burner



Feb. 9, 1932. A. T. SPbNAR 1,844,302

BUNSEN BURNER Filed July 24, 1929 ZSheets-Sheet 1 A. T. SPONAR BUNSEN BURNER Feb. 9, 1932.

Filed July 24, 1929 2 Sheets-Sheef 2 w Filip Patented Feb. 9, 1932 UNITED STATES PATENT OFFICE" ALOYSIUS .l. SPON'AB, OF OONSKOHOCKEN, PENNSYLVANIA, ASSIGNOR T JOHN WOOD MANUFACTURING COMPANY, OF' GONSHOHOGKEN, PENNSYLVANIA, A CORPORA- 'IION OF PENNSYLVANIA BUHSEN BU Application M July at, me Serial. m. asasoe.

My invention is particularly ap lica'ble to such burners embodied in a gas red water heateror boiler for domestic use wherein the supply of gas to the burner may be shut 0d by'an automatically operative valve, under control of a thermostat or some device opera tive by changes in the fluid pressure in the heater or the piping connected therewith. In

order to make such burners of maximum ca-' pacity for combustion within minimum dimensions, the burner orifices are necessanly made so large that when the gas is shut oti feature of my invention is means whereby the primary air supply to the burner may be.

shut off simultaneously with the shutting of? oi the gas supply, with the sheet that upon such cessation of the supply of gas and air the residue of the mixture thereof in the burner and the conduits leading thereto, is

gradually consumed above the burner jet openings, without any back-flash of the harm or flames thru said openings and, consequently, without any noise. I

My invention includes the various novel features of construction and arrangement burner structure, taken on the line IV, IV, in

Fi I. v

ig. V is an end elevation of said gas valve. Fig. V1 is a vertical sectional view of a heater conveniently embodying such a burner structure.

The heater shown in Fig. VI is the subjec matter of m copending application Serial No. 384,631 led August 9, 1929, for Letters 1 Patent of the United States, said application.

having resulted in Patent sued June 16, v1.931.

In said figures, the Bunsen burner comprises two concentric tubular rings 1 and 2 having respective slot orifices 3 and 4 formed in thetop thereof by saw cuts. The combustible mixture of air and gas is supplied to said rings thru a pair of Venturi mlxing tubes 6 which are oppositely gcounterpart. Each 0 No. 1,810,887, is-

said tubes 6 has a bell end 7 having the endwall 8 transverse to its axis, with an air inlet 1 port 9 opening therethru. Each of said walls 8 supports a tubular extension 10 in coaxial relation with the respective tubes 6 and having a screw thread 11 upon the exterior thereof for engagement with a gauge disk 12 which is thus ad uStable, by rotation, toward and'awa from the respective air inlet 9 to adjustab y limit the rate of flow thrusaid inlet from the manifold 14 which is a rectanar box supported by said tubes 10 and held in the position shown by nuts 15 engaging-said tubes. Said manifold box 1 1 is provided with the movable to closure consisting of the flap valve 16, hinged to said box 14- at 17, and pivotally connected at 18 with the wire link 19 by which it may be opened and closed as hereinafter described. When said valve 16 is opened to the position shown in dotted lines in Fig. Ill, which is the normal operating position or: the hurnem-suficient primary air is admitted to said. manifold 14 to supply the manna quantity of combustible mixture which it is possible to burn in flames 20 and 21 at said slot orifices 3 and d but, when said valve 16 is shut, in the position indicated in full lines in Fig. lg; all of the primary air is entirely shut o r Fuel gas is supplied to the mining chem wil bers in the tubes 6 and their bell ends 7 thru which tends to press said valve upon its seat 31 in said casing 28.

A Said valve 27 is arranged to be opened by providing said plunger 29 with rack teeth 33 engaged by the gear 34 of a train of gears which is driven by the gear 38 on the armature shaft 39 of the electric motor 40. Said motor is included 111 the electric circuit comprising the conductors 41 and 42 and including the thermostat 44 comprising the electric switch 45 of any suitable construction. The

I arrangement is such that said motor circuit is closed at said thermostat when the temperature of the surrounding atmosphere falls below that for which said thermostat is set and, thereupon, said motor opens said valve 27 to augment the flames 20 and 21 to thereby raise the temperature of said atmosphere.

When said valve stem 29 reaches the upper limit of itsstroke; said motor 40 stalls and stops but, as lon as it is energized thereafter it acts as an e ectric magnet holding said valve 27 wide open. However, said thermostat opens said circuit when the temperature of said atmosphere is restored to the predetermined degree'for which said thermostat is set, and thereupon said spring 30 lowers said valve stem 29 and the valve 27 to the closed position, shutting off the main supply of gas to the burner. c

I find it convenient to directl connect said wire link 19 with the upwar ly projecting portion of said plun er 29 so that said valves 16 and 27 are there y directly coupled. for simultaneous movements, both to open and close them. I Consequently,when saidmotor circuit is broken, by said thermostat, or otherwise, and said gas valve 27 is closed by its spring 30; said air valve 16 is contemporaneously closed, thus shutting off the entire supof rimary air to said burner, with the p y e ect t at 'the residue of the combustible.

and inclosing the combustion chamber 48 within the interior casing 49 from which the flue casings 50 and 51 extend to the flue outlet 52 in the top of said casing 46.

I find it convenient to construct said Bunsen burner as indicated in Fig. IV wherein said rings 3 and 4 so that the the rings land 2 are ri 'dly connected by the gas manifold 54 whic however does not communicate with either ring. Said manifold 54 is directly suppliedwith undiluted fuel gas, thru the pipe 55 which extends from the gas main 26 and is controlled by the valve 5Q. Said manifold 54 carries the two pilot" jet tubes 58 which extend upwardly between pilot flames 59 at the top thereof are in position to'ignite the gas flowing from b0th,of said rings to form the flames 20 and 21.

As indicated in Figs. I and IV, I find it convenient to form said Venturi tubes 6 as respectively separate castings and to rigidly connect the same with said rin s by the screw means 60; the joints being ma e cement 61 interposed thereat.

gas-tight by However,I do not desire to limit myself to the precise details of construction and arrangement-herein set forth, as it is obvious that various modifications may be made therein without departing from the essential features of my invention, as defined in the appended claims.

\ I claim:

"1. In a Bunsen burner, the'combination with a hollow body having a plurality of orifices in the top thereof; of a mixing chamber conne'c-ted with said hollow body and having a gas inlet and an air inlet; reciprocatory and oscillatory valves respectively controlling the effective area of said gas inlet and air inlet; and means cooperatively connecting said valves, including a link adjustably rigidly connected with said gas valve and pivotallyconnected with said air va ve.

2. In a Bunsen burner, the combination with a hollow body having a plurality of orifices in the top thereof of a mixin chamber connected with said hollow bo y and having a gas inlet and an air inlet; valves respectively controlling the effective area of said gas inlet and air inlet; means cooperatively connecting said valves, including a reciprocatory plunger; a link rigidly connected with one of said valves and ivotally connected with the other of sai valves; and an electrically operative motor, continually engaging said p unger, local to one of said valves, and adapted to open both of them when energized.

3. In a Bunsen burner, the combination with a hollow body havin a plurality of orifices in the top thereof; 0 a mixing chamber connected with said hollow body and having a gas inlet and an air inlet; valves respectively controlling the effective area of said gas inlet and air inlet; means cooperatively connecting said valves, including a reciprocatory plunger; an electrically operative motor, continually engaging said plunger, local to one of said valves, and adapted to open both of them when enerber connected with said hollow body and having a gas inlet and an air inlet; valves respectively controlling the effective area of said gas inlet and air inlet; means cooperatively connecting said valves; an electrically operative motor local to one of said valves, and adapted to open both of them and hold them open when energized; anda thermostatically operative switch in said motor circuit; whereby said gas and air valves are' operated to reduce the heating efiect of the burner when the atmosphere at the thermostat reaches a predetermined temperature.

5. In a Bunsen burner, the combination with a primary air manifold com risin a rectangular box having an air in flap valve adapted to open and close said air inlet; aplurality of Venturi mixing tubes, having tubular screw threaded extensions ex tendin thru and detachably rigidly connected wit said manifold, by nuts respectively engaging said extensions exterior to said box; gas inlet tubes respectively in cooperative telescopic relation with said Venturi tubes; a gas valve controlling the supply of gas to said gas tubes; and means cooperatively connecting said air valve with said gas valve; whereby they may be operated in predetermined relation.

6. in a Bunsen burner; the combination with a hollow cast body having flame orifices in the top thereof; a Venturi tube detachably connected to said body, and adapted to sup ply a combustible mixture of gas and air to said orifices; a. separate gas conduit in unitary relation with said body, extending transverselythereto and having pilot gas iets atrespectively opposite sides or? said body; and means adapted to supply undiluted gas to said gas conduit; whereby said combustible mixture may be ignited by flames main tained at said pilot jets.

7. A Bunsen burner structure, as in claim 6; wherein the hollow body includes two concentric rings, in radially spaced relation,

each having flame orifices in the top thereof, and said separate gas conduit is in diametrical unitary relation with said rings, and bridges the space between them, and said pilot jet tubes extend in the space between said rings, parallel with the axis oi said rings and intersecting a common diameter thereof.

8. in a Bunsen burner; the combination with a single casting including two hollow rin s in coaxial spaced relation, having flame ori ces in the top thereof, and having a portion extending diametrically with respect to said rings, in unitary relation therewith and rigidly connecting them, and inclosing a gas conduit having means excluding it from communication with either of said rings; of pilot jet tubes in communication with said gasv conduit and extending between said rings, at opposite sides thereof and at a commondiameter thereof; means adapted to supply a combustible mixture of 1 gas and air tosaid rings, including oppositely counterpart mixing tubes; means separatelydetachably connecting said tubes with said rings at a common diameter of the latter; and means adapted to separately supply gas to said conduit and jet tubes; whereby, separate pilot flames may be maintained at' said jet tubes regardless of' whether the burner rings are lighted or not, and which are adapted to ignite any combustible mixture escaping from the orifices in said rings.

9. A'single casting for aBunsen burner includin two hollow rings in coaxial relation and having flame orifices in the top thereof; a member of said casting extending diametrically transversely to the axis of said rings in unitary relation therewith and inclosing a gas conduit excluded from communication with said rings; diametrically opposite openings in the bottom of said casting local to the opposite ends of said gas conduit and in communication with both of said rings; said openings being adapted to register with separate Venturi tubessupplying a combustible mixture to said rings;

and said gas conduit being adapted to support pilot jet tubes between said rings in communication with said gas conduit;- said gas conduit having a gas supply inlet.

10. The combination with a casting as in claim 9, of two other castings forming oppositely counterpart 'Venturi-tubes adapted to register with said openings; and means rigidly connecting said Venturi tubes with said burner casting in gas-tight relation. I

Ill. The combination with a Bunsen burner; of means adapted to prevent backiiring from the burner orifice into the iuel'mixing chamber of said burner, when the gas is suddenly shut oil including a gas valve operative by a reciprocatory plunger, carrying v rack gear teeth, an electric motor operatively said gas valve; means controlling the admission of primary air to said burner including a manifold with an air inlet; and a flap valve hingedly connected with' said manifold and movable to open and close said air inlet; and means operatively'c onnecting said gas valve with said air valve; including a wire link pivotally connected with said air valve, and adjustably connected with said plunger; whereby operation of said motor and plunger to open said gas valve, simultaneously opens said air valve, and operation of said plunger to close said gas valve, simultaneous y closes said air valve.

12. Apparatus as in claim 11; including a spring connected to said plunger and o posed to said motor, adapted to close and valves when said motor is deenergized.

13. Apparatus as in claim 11;-including a thermostatic switch controlling the operation of said motor; whereby the o ration of 0 said burner is controlled in acco ance with the tem rature at said thermostatic switch.

14. This combination with a Bunsenburner; of means adapted to prevent hackfiring from the burner orifice into the fuel mixing 5 chamber of said burner, whenthe is suddenly shut off including a gas V0 and an air valve, areciprocate gear "rack operatively connected. with bot of said valves, an electric motor operatively connected with i 80 said rack, b a rotary gear, adapted to reciprocate it an thereby openboth-of said-valves;

and a spring connected; with said rack in Y opposition to said motor, and adapted to c ose both of said valves w e 'said'motor is defl'energ'ized.

15. Apparatus asin claim 14; including a thermostatic switch controlling the operation of said motor; whereby, the operation of said burner is controlled inaccordance with 80 thetenipera'ture at said "thermostatic switch.

In testimony whereof I" have hereunto signed my name at Conshohocken Pennsylvania',th1s twenty-second day of July, 1929.

' I ALOYSIUS T. SPONAR. 

